public class Product {
    private String id;
    private String name;

    // 构造方法、getter 和 setter 等
    public Product() {}

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

public class ProductModel {

    // 模拟数据库操作或与服务器交互来处理产品的上架和下架
    public boolean upShelfProduct(Product product) {
        // 这里可以添加实际的逻辑，比如向服务器发送请求
        return true;
    }

    public boolean downShelfProduct(Product product) {
        // 这里可以添加实际的逻辑，比如向服务器发送请求
        return true;
    }
}

public interface ProductView {

    void onUpShelfSuccess();

    void onUpShelfFailure(String error);

    void onDownShelfSuccess();

    void onDownShelfFailure(String error);
}

public class ProductPresenter {

    private ProductModel productModel;
    private ProductView productView;

    public ProductPresenter(ProductModel productModel, ProductView productView) {
        this.productModel = productModel;
        this.productView = productView;
    }

    public void upShelfProduct(Product product) {
        boolean result = productModel.upShelfProduct(product);
        if (result) {
            productView.onUpShelfSuccess();
        } else {
            productView.onUpShelfFailure("上架失败");
        }
    }

    public void downShelfProduct(Product product) {
        boolean result = productModel.downShelfProduct(product);
        if (result) {
            productView.onDownShelfSuccess();
        } else {
            productView.onDownShelfFailure("下架失败");
        }
    }
}

public class MainActivity extends AppCompatActivity implements ProductView {

    private ProductPresenter productPresenter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ProductModel productModel = new ProductModel();
        productPresenter = new ProductPresenter(productModel, this);
    }

    public void onUpShelfButtonClicked(View view) {
        Product product = new Product();
        // 设置产品信息
        productPresenter.upShelfProduct(product);
    }

    public void onDownShelfButtonClicked(View view) {
        Product product = new Product();
        // 设置产品信息
        productPresenter.downShelfProduct(product);
    }

    @Override
    public void onUpShelfSuccess() {
        Toast.makeText(this, "上架成功", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onUpShelfFailure(String error) {
        Toast.makeText(this, error, Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onDownShelfSuccess() {
        Toast.makeText(this, "下架成功", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onDownShelfFailure(String error) {
        Toast.makeText(this, error, Toast.LENGTH_SHORT).show();
    }
}